What difference in the 5400's 2.9L engine causes it to take 2.5 qts more of oil than the 2.9L in the 5300? Can the turbo require that much oil? The reason I ask is cause this morning I changed the oil on my 5300. The manual says it takes 6.3 qts of oil. Guess what? Just barely on the dip stick. My first thoughts would be that the 5400 might have a larger oil pan. Nope both models use tyhe same pan,stick, guide etc. Matter of fact the only difference I can find in the two tractors is that the 5400 is turbo charged.